Long story short, yes you should be able, but you’ll need the lightning (or usb c) adapter to usb, then import to iPad and from there import to LR.

Beware of one detail: despite being APFS, the files are duplicated (in size) so you need double the free space in order to import them in LR. You can obviously delete the picture from Photos to clear some space!

Currently there is no way to directly import into Lightroom CC on mobile from an SD card or camera. It is a limitation created by Apple, not one from Lightroom CC. I’m hoping that it may change with the release of the new iPad Pros... perhaps next year with iOS 13.

There is one workaround that I have found, that both solves for this workflow, and provides additional backup. It requires a Western Digital My Passport Wireless Drive (either the SSD or the Pro). These drives have built-in SD card readers that will import your photos to the drive. They also have integration with the Files app, Making your files available at the OS level..

The workflow works like this: plug your SD card into the drive and have it import your photos. Then, select an album in Lightroom CC, or make a new one (this only works in albums, not in All Photos). When you tap to import, you’ll have the option to import from Files. You can then select the drive as the source, select your photos, and import,

I use the WD My Passport also, but sometimes I don't feel like carrying it around when I'm local and a SD adapter suffices. Alternatively, you can streamline the import and delete process using a Siri Shortcut, here’s my workflow as an example:

After importing the photos to your iOS device, that shortcut will automatically import the photos into Lightroom and delete them. Takes a few seconds to process 256gb of raw files / photos. But there’s more steps in that Shortcut than you need. -- The process first checks for photos imported to iOS via Leica's Fotos app, then macOS' Photos app imports, then iOS SD card imports, compiles them into a list before finally importing that list into Lightroom, then it deletes the imported photos, and enables VPN for secure cloud syncing if on a non-trusted wifi network.

Excessive, but you can just delete anything unnecessary. At the very least you should delete the VPN step at the end, the 3 second pause after that, and the final open Lightroom step. Those things are only needed if VPN shortcut will be used, since it switches to the VPN app and requires a 3 second wait for the VPN connection to be established, before needing to switch back to (open) Lightroom. Without any of that Lightroom would just stay open.